Leather-stretching machine



(No Model.)

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Patented Mar. 18, 1890.

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(No Model.) 4 Sheets-Sheet 2,

s. A. WEST & 0. SINNING. LEATHER STRETOHING MACHINE.

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(No Model.) 4 SheetsSheet 3. S. A. WEST & G. SINNING. LEATHER STRETGHING MAGHINE.

Patented Mar. 18. 1890.

(No Model.) 4 SheetsSheet 4 S. A. WEST 8: O. SINNING'. LEATHER STRETOHING MAGHINE.

No; 423,846. Patgnged Mar. 18, 1890.

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I UNITED STATES PATENT OFFICE.

STILLMAN A. VEST AND CHARLES SINNING, OF ST. LOUIS, MISSOURI.

SPECIFICATION formingpart of Letters Patent No. 423,846, dated March 18, 1890.

' Application filed April 6, 1889. Serial No. 306.254. (N0 model.)

To all whom it may concern.-

Be it known that We, STILLMAN A. \VEST and CHARLES SINNING, both of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Machines for Stretching Leather, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

This machine-is intended to stretch the edge of the upper of a boot or shoe at the shank before lasting.

Figure I is a side elevation of the machine, the table or stand being in vertical section. The shoe-upper is shown in position and the operator about to work the treadle. Fig. II is a transverse section of the treadle-lever at II II, Fig. I. Fig. III is a transverse section of the treadle-lever at III III, Fig. I. Fig.

IV is a transverse section of the treadle-leyer,

at IV 1V, Fig. I. Fig. V is a side elevation of the machine with the jaws open ready to receive the work. Fig. VI is a longitudinal section of the machine at VI VI, Fig. VII. Fig. VII ,is a plan of the machine with the jaws oper. section at VIII VIII, Fig. 'VII'. Fig. IX is a lQtail transverse section through the central toggle-hinge at IX IX, Fig. VII. Fig. X is a transverse section of the machine at X X, Fig. VII. Fig. XI is a transverse section of the machine at XI XI, Fig. VII. Fig. XII is a detail plan showing the jaws closed upon the leather. Fig. XIII is a tranverse section at XIII XIII, Fig. VII.

1 is the table or stand, to which the machine is secured by bolts or screws 2, which pass through the legs 3 into the table.

4 is the bed-piece of the machine,- having standards 5 and 6, in whose bearings 7 slide the longitudinal rods 8. These rods carry at the front end a cross-head 9, firmly secured to the rods by pin 10. The cross-head carries one of the jaws, which is composed of anumber of vertical edged teeth 11, between which are inclined recesses 12. The other jaw is upon a sliding head 13, which works on the rods 8 as guides. This jaw 13 has teeth 14-,

Fig. VIII is a detail transverse whose front edges are inclined, as seen in Fig. VI, projecting farther at the top than at the bottom, so as to stretch the leather the most at the edge which is at top.

The central tooth 11 is a spring-tooth, having a square or splined shank 11 working in a socket in the jaw 9 and retained by a pin 11 11 is a spiral spring, bearing against the shoulders 11 and tending to hold the tooth 11 in its advanced position, as seen in Fig. VII. The spring, however, allows the retreat of the tooth in the position shown in Fig. XII, so as to relieve that part of the leather from a part of the strain which would otherwise come 'upon it. The part of the leather thus relieved is the point occupied by the seam between the quarter and vamp, and the purpose of relief is to preventthe opening or ripping of or-tearing of the leather at the seam. The seam is during the act of stretching held between the spring-tooth and a projection 14: of the plate 15, having a rounded recess M fitting the tooth 11'. Itwillbe seen that the spring-tooth will force the seam into the recess and hold it with a moderate degree of pressure before the stretching action begins, so that the spring-tooth serves to assist in holding the leather in position. (See Figs. VI, VII, and XII.)

The teeth 14 are removable, so that teeth of different shape or size may be substituted. For this purpose they are upon a block 15,

fitted to the cross-head 13 and attached thereto by screws 16.

17 are pins upon the ends of the cross-head 13, upon which are looped the front ends of the Spiral draw-springs 18, whose other ends are looped. upon the pins 19 upon the standard 6. The tendency of the springs is to draw the cross-head 13 to its rear position, as seen in Figs. I, V, and VII. In their movement forward and backward the teeth 14 work through an aperture in the standard. (See Fig. X.)

The cross-head has a rounded rib 20, which enters a rounded recess 21 of the standard 5 as the cross-head 9 moves backward and grips the leather, while the cross-head 13 is still at rest, so that when the latter moves forward the part of the leather between the two points shall be stretched by the overlapping teeth 11 and 14.

22 are adjustable guides for the leather in its insertion between the jaws.

23 is a cross-bar upon the rods 8, secured thereto by pins 2i. The cross-bar and the cross-head 13 have similar bearings 25 for the rounded ends 26 of the toggle-bars 27. The toggle-bar pintle 22 passes through acoupling-block 29, having a screw-socket 30, in which screws the upper end of the rod 31, connecting the' pintle with the horizontal arm 32 of the treadle-lever, said lever being fulcrumed at The lever is made in two parts 3t 35 with adjustable connection. The upper part it has a channel 36, in which fits the upper end of the lower part 35, having endwise movement in the channel, b u t locked in position by a bolt 37, which passes through a bolt-hole in one part and longitudinal slot 38 in the other part. (See part 3%, as shown.) The lower part 85 is shown with a rib 38, adding to its stiffness and affording means to prevent the turning of the bolt 37, as the head of the latter is recessed, as seen in Fig. III, to receive the rib.

39 is the treadle, pressure upon which draws down the toggle from the position shown in Fig. V. The descent of the toggle is limited by a stop-nut -10 upon the rod 31, which regulates the amount of stretch, as desired. (See Fig. VI.) Beneath the nut 40 is a rubber block 4:1.

42 are spiral springs surrounding the rods 8 between the standard (5 and the crossbar 23. These springs thrust the cross-bar forward, and with it the rods 8 and cross-head 9. The springs -12 are weaker than the springs 18, so that the first movement of the parts on the depression of the toggle is to force the cross-head 9, rods 8, and crossbar backward until the leather is firmly gripped at 11' 14 and 20 21, which will prevent the further backward movement of these parts, the cross- 1 20 on one jaw, and a standard 5, having recesses 21, all adapted to operate substantially as and for the purposes set forth.

2. Ina machine for stretching shoe-quarters, the combination of the movable jaws havmg overlapping teeth 11 and 1.4, the toggle 5 with its ends 26 acting, respectively, upon the two "aws and the s )rin 's i2 and 1d of differcut strength, all constructed and adapted to operate substantially as set forth.

3. In a machine for stretching shoe-quarters, the combination of the movable jaws having overlapping teeth 11 and 14, the toggle with its ends 26 acting, respectively, on the two jaws, the springs 42 and 18, differing in strength, the standard having recesses 21, and projections 20 upon the front jaw, all constructed and adapted to operate substantially as set forth.

4. In a machine for stretching shoe-quarters, the combination of the rods 8, slidingin bearings, the cross head or jaw 9, fixed to the rod 8 and carrying teeth 11, the cross-bar 23, fixed to the rods, the cross-head 13, sliding on the rods and carrying teeth 14, the springs 18, acting on the cross-head 13, springs t2, of less power than the springs 18, acting on the crossbar, and the toggle with ends respectively acting on the cross-bar 23 and cross-head 13, substantially as and for the purpose set forth.

5. In a machine for stretching shoe-quarters, the combination of reciprocating jaws having interlocking teeth 11 and 14, the lat ter being inclined on the edges, one of said jaws having a resilient tooth, substantially as and for the purpose set forth.

6. In a machine for stretching shoe-quar ters, the combination of the two reciprocating jaws with overlapping teeth 11 and 14, the toggle acting to force the jaws toward each other, springs varying in strength and acting to draw the jaws apart, and means for operating the jaws, substantially as and for the purpose set forth.

7. In a machine for stretching shoe-quarters, the combination of the jaws with teeth 11 and 1.1, s )rings 18 and 42, drawing them asunder, the toggle 27 28, drawing them togcther, and a treadle-lever connected with the pintle 28 of the toggle and having extensible part ill 35, substantially as set forth.

8. In a machine for stretching shoe-quarters, the combination of the two movable jaws 9 and .13, having overlapping teeth 11 and 14, the spring-tooth 11 on one jaw, and projection 14. on the other jaw, substantially as and for the purpose set forth.

9. In a machine for stretching shoe-quarters, the combination of the moving jaw 5), having teeth 11, spring-tooth 11', and rib 20, the standard having the recesses 21, and the moving jaw .13, having the teeth 14, and the projection ll, all substantially as and for the purpose set forth.

STILLMAN A. \VEST. (ilIAltLEs HINNING.

Witnesses:

sAnL. KNIGHT, Gno. II. KNIGHI.

IIO 

